Re: Last Call: draft-klensin-rfc2821bis
Henning Schulzrinne <hgs@cs.columbia.edu> Sat, 29 March 2008 15:11 UTC
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From: Henning Schulzrinne <hgs@cs.columbia.edu>
To: Theodore Tso <tytso@MIT.EDU>
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Subject: Re: Last Call: draft-klensin-rfc2821bis
Date: Sat, 29 Mar 2008 11:10:54 -0400
References: <47EA8CD8.3010500@network-heretics.com> <alpine.BSF.1.00.0803261436260.36932@simone.iecc.com> <11a101c88f75$96b63bd0$c422b370$@net> <47EAB7E3.4060308@dcrocker.net> <47EACFB4.5010100@cisco.com> <alpine.LRH.1.10.0803290926060.7344@netcore.fi> <9D58802557DBD059763C0316@p3.JCK.COM> <01MSZFLDOT0U000078@mauve.mrochek.com> <47EE499E.5090602@dcrocker.net> <47EE4F2A.8040801@network-heretics.com> <20080329143401.GB32033@mit.edu>
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Cc: Keith Moore <moore@network-heretics.com>, ietf@ietf.org
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One of the problems I have seen first-hand is "disappearing" mail. Example: A webserver sends outbound email directly, but doesn't want to receive inbound email. The hostname leaks and mail gets sent to that address, based on the A(AAA) record. The mail is "received", but disappears into some never-seen /var file. In that case, the sender never suspects that anything is amiss; it would be much better if the sender got an immediate "sorry, that domain name doesn't support email service" error. Even if you turn off sendmail, as someone has pointed out earlier, the sending MTA will retry for several days until giving up, thus delaying error notification that would be immediate otherwise in this particular case. You can obviously turn off sendmail local delivery, but many of the standard web hosting (cPanel and kin, but also the standard RH mail setup) arrangements don't make it particularly easy to have outbound- only sendmail. Thus, disabling AAAA checking seems to provide much cleaner error behavior. The 'MX 0' proposals would achieve some of the same results, but removing the AAAA lookup is default-safe, rather than requiring operator action. It's too late to change the A behavior, but there doesn't seem to be a reason to perpetuate this violation of the principle of least surprise. Henning On Mar 29, 2008, at 10:34 AM, Theodore Tso wrote: > On Sat, Mar 29, 2008 at 10:16:10AM -0400, Keith Moore wrote: >> I think it is time to put an end to specious arguments. >> >> These standards get used for decades. I don't think it's >> appropriate to >> cripple them because of some arrangement that happens to exist now >> from >> a few dysfunctional DNS providers. Providers will get more >> flexible as >> the need becomes apparent, and domain owners who have problems with >> their DNS providers can change providers. It's not difficult. > > So I must be missing something, probably because I deleted without > reading closely enough one of the earlier messages on this thread. > But please indulge me --- exactly what is the benefit of deprecating > the "A" fallback, and/or not doing a lookup on the AAAA record if the > MX record doesn't exist? Is it the load on the nameservers that > people would believe would be reduced if we didn't do this? Is that > really a problem? Or is it something else? > > - Ted > _______________________________________________ > IETF mailing list > IETF@ietf.org > https://www.ietf.org/mailman/listinfo/ietf _______________________________________________ IETF mailing list IETF@ietf.org https://www.ietf.org/mailman/listinfo/ietf
- RE: Last Call: draft-klensin-rfc2821bis (Simple M… Hollenbeck, Scott
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Pete Resnick
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Lists and aliases (Re: Last Call: draft-klensin-r… Harald Tveit Alvestrand
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Pete Resnick
- Re: Lists and aliases (Re: Last Call: draft-klens… Ned Freed
- Re: Lists and aliases (Re: Last Call: draft-klens… Tony Finch
- Re: Lists and aliases (Re: Last Call: draft-klens… Ned Freed
- Last Call: draft-klensin-rfc2821bis (Simple Mail … Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis John Leslie
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Willie Gillespie
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Markku Savela
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- RE: Last Call: draft-klensin-rfc2821bis Hallam-Baker, Phillip
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Implicit MX and A RRs (was: Re: Last Call: draft-… John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Implicit MX and A RRs Tony Hansen
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Tony Finch
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis Eliot Lear
- RE: Last Call: draft-klensin-rfc2821bis Tony Hain
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- RE: Last Call: draft-klensin-rfc2821bis Hallam-Baker, Phillip
- Re: Last Call: draft-klensin-rfc2821bis Willie Gillespie
- IPv6 incentive? RE: Last Call: draft-klensin-rfc2… Hallam-Baker, Phillip
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Jim Fenton
- Re: Last Call: draft-klensin-rfc2821bis David Conrad
- RE: Last Call: draft-klensin-rfc2821bis Tony Hain
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- RE: Last Call: draft-klensin-rfc2821bis Hallam-Baker, Phillip
- RE: Last Call: draft-klensin-rfc2821bis Tony Hain
- RE: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Implicit MX and A RRs John C Klensin
- Re: Implicit MX and A RRs Matti Aarnio
- RE: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Implicit MX and A RRs Tony Finch
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Joe Abley
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis David Morris
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Implicit MX and A RRs Keith Moore
- RE: Last Call: draft-klensin-rfc2821bis michael.dillon
- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Implicit MX and A RRs Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Theodore Tso
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis SM
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis David Morris
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Tony Finch
- Re: Last Call: draft-klensin-rfc2821bis Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis: closing … Tony Hansen
- Re: Last Call: draft-klensin-rfc2821bis: closing … Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis: closing … Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis: closing … Lisa Dusseault
- Re: Last Call: draft-klensin-rfc2821bis: closing … Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis: closing … Hector Santos
- Re: Last Call: draft-klensin-rfc2821bis: closing … Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis: closing … Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis: closing … Paul Smith
- Re: Last Call: draft-klensin-rfc2821bis: closing … Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis: closing … Tom.Petch
- Re: Last Call: draft-klensin-rfc2821bis: closing … Hector Santos
- Re: Last Call: draft-klensin-rfc2821bis: closing … Robert A. Rosenberg